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Some comments on emittance of H− ion beams

Paul Allison

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Abstract

Some properties of emittance, emittance distributions, and measurement techniques are reviewed. In comparing the results of measurements with several different types of H− sources with each other and with emittance formulae, it is concluded that the emittance of surface‐type sources is dominated by the effective ion temperature. Other effects, such as ion‐optical distortions, may account for the emittance of volume‐type sources.

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What this paper is about

Some properties of emittance, emittance distributions, and measurement techniques are reviewed. In comparing the results of measurements with several different types of H− sources with each other and with emittance formulae, it is concluded that the emittance of surface‐type sources is dominated by the effective ion temperature. Other effects, such as ion‐optical distortions, may account for the emittance of volume‐type sources.

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Available abstract

Some properties of emittance, emittance distributions, and measurement techniques are reviewed. In comparing the results of measurements with several different types of H− sources with each other and with emittance formulae, it is concluded that the emittance of surface‐type sources is dominated by the effective ion temperature. Other effects, such as ion‐optical distortions, may account for the emittance of volume‐type sources.

Key concepts: Thermal emittance, Ion, Beam emittance, Optics, Physics, Materials science, Atomic physics, Beam (structure)

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